BAPI Wireless Room Temperature and Humidity Transmitter Installation And Operating Instructions

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Installation and Operating Instructions

Wireless Room Temperature and Humidity Transmitter

(

Units without Temperature Setpoint or Override) 

Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI  54631 USA

Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:sales@bapihvac.com • Web:www.bapihvac.com

Specifications subject to change without notice.

rev. 06/27/14

1 of 5

Wireless Temperature and Humidity Transmitter Overview and Indentification

The BAPI Wireless Temperature and Humidity Transmitter measures the 

room temperature and Relative Humidity and transmits the data at 418MHz 

or 433MHz RF to a receiver. The transmitter is mounted in a BAPI-Stat 2 style 

enclosure and has maximum in-building range of open-air range of 100 feet.

The transmit rate is approximately once every 10 seconds with an estimated 

battery life of 5 to 8 years using two high-capacity 3.6V lithium batteries.  Each 

transmitter has a unique address with built-in error detection.  Each variable 

sent by the transmitter is picked up by the receiver and converted by a sepa-

rate BAPI Analog Output Module to a voltage, current or resistance signal 

which is sent to the controller. 

Fig. 1: 

Wireless Room 

Temperature 

Transmitter

Customer Provided Tools and Materials

#2 Philips Screwdriver, 1/8” Screwdriver with 1/16” Allen wrench (BA/116W), Drill with 3/16” (4.7mm) bit

Complete Wireless System Overview

418 MHz System:

The Transmitter measures the temperature or 

temp/humidity and transmits the data at 418MHz to 

the 418 MHz Receiver up to 100 feet away.  The op-

tional temperature setpoint and override status are 

also transmitted at 418 MHz to the receiver.  The 

transmit rate is about once every 10 seconds with 

an estimated battery life of 5 to 8 years. 

The information sent by the Transmitter is picked 

up by the 418 MHz Receiver and passed along 

to the Analog Output Modules. Each transmitted 

variable (temperature, humidity, setpoint, etc.) is 

converted by a separate output module into an 

analog resistance, voltage, current or relay contact 

which is hard wired to the analog inputs of the BAS 

controller. 

900 MHz System:

The Transmitter mea-

sures the room tempera-

ture or temp/humidity and 

transmits the data at 

418MHz to a Repeater 

up to 100 feet away. The 

optional temperature set-

point and override status 

are also transmitted at 

418 MHz to the Repeater. 

The transmit rate is ap-

proximately once every 

10 seconds with an 

estimated battery life of 5 

to 8 years. 

The 418 MHz informa-

tion sent by the Transmitter is picked up by the Repeater and then Re-Transmitted at 900 MHz to a 900 MHz Receiver up to 

1,000 feet away. The 900 MHz receiver picks up the information from the repeater and then passes it along to the Analog Output 

Modules. Each transmitted variable (temperature, humidity, etc.) is converted by a separate output module into an analog resis-

tance, voltage, current or relay contact which is hard wired to the analog inputs of the BAS controller.

418 MHz

Up to 100 

Feet 

Transmitter

Transmits the  

Temperature, 

Humidity, 

Setpoint and 

Override Info

900 MHz Receiver

Receives the Temperature, Humidity, Setpoint 

and Override Info from the Repeater and 

passes it on to the Analog Output Modules

Analog Output Modules

Converts the Temperature, 

Humidity, Setpoint and 

Override Info into an analog 

resistance, voltage, current 

or relay for the BAS controller

Fig. 3: 900 MHz Wireless System

900 MHz

Up to 1,000 

Feet 

Repeater

Receives the 418 MHz 

Info from the Transmitter 

and Re-Transmits it at 900 

MHz up to 1,000 feet

418 MHz

Up to 100 Feet 

Transmitter

Transmits the  

Temperature, 

Humidity, 

Setpoint and 

Override Info

418 MHz Receiver

Receives the Temperature, Humidity, Setpoint 

and Override Info from the Transmitter and 

passes it on to the Analog Output Modules

Analog Output Modules

Converts the Temperature, 

Humidity, Setpoint and 

Override Info into an analog 

resistance, voltage, current 

or relay for the BAS controller

Fig. 2:

418 MHz 

Wireless 

System